.ldf files are too bigger than .mdf files in SCOM databases

Hi There,

I have a production issue where all SCOM databases (SQL 2012 SP3) ldf files are getting bigger than mdf files. All SCOM database are pointing to always-on group with two diffrent AG's. 

The current size of databases are:

DB NAME                    .mdf Size          .ldf Size
--------------------------------------------------------------------------
OpertManager               30GB                167GB                  
VirtualManager              2GB                  130GB
Orch                             8GB                  15GB 
VManagerDW                100GB              71GB 

we have also log backup job is running everyday but doesn't look like much difference. I don't want to shrink the log files as all 4 databases are in AG's group.

Can someone please help me to fix the issue?

Cheers,
Ken